Year	% (cumulative)
1970	19.1567497253418
1980	37.278621673584
1990	47.9384803771973
2001	62.2371292114258
2005	70.8077774047852
2009	78.9625473022461
2010	80.0576934814453
2011	80.7637023925781
2012	81.4917831420898
2013	82.2211380004883
2014	79.1050567626953
2015	79.7727584838867
2016	80.8170776367188
2017	81.9304428100586
2018	82.6848678588867
2019	82.8523101806641
2020	84.1618576049805
2021	84.8379364013672
2022	85.7719573974609